SwiftUI - Using @main to set the rootViewController

Question

When using the SceneDelegate in SwiftUI, it was possible to create a function like the one below that could be used to set the view as shown here. However, in the latest version we now use a WindowsGroup. Is it possible to write a function that changes the view in the WindowsGroup?

func toContentView() {
   let contentView = ContentView()
      window?.rootViewController = UIHostingController(rootView: contentView)
}

Answer 1

Here is possible alternate approach that do actually the same as your old toContentView

1. helper class

class Resetter: ObservableObject {
    static let shared = Resetter()

    @Published private(set) var contentID = UUID()

    func toContentView() {
        contentID = UUID()
    }
}

2. content of @main

    @StateObject var resetter = Resetter.shared
    var body: some Scene {
        WindowGroup {
            ContentView()
               .id(resetter.contentID)
        }
    }

3. now from anywhere in code to reset to ContentView you can just call

Resetter.shared.toContentView()